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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54397123f6375433ed1c973a2d70360d97d77fa0b13fa7d4cb876fccad50855' 
  AND token = '7Gv2HZGuzrurx1F5ReWMVqPcy8Ju99Baa5sMnMSVp2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}